CVE-2026-81738
Description
A flaw was found in OpenVPN when using the tap-windows6 driver. A remote attacker could exploit this vulnerability by sending specially crafted DOMAIN-SEARCH entries. This could lead to an out-of-bounds write, potentially causing information disclosure or a denial of service.
Statement
This Low impact vulnerability in OpenVPN affects Windows installations utilizing the tap-windows6 driver. Red Hat products are not directly impacted as they do not deploy OpenVPN with this specific Windows driver.
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
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